Best available copy



BEST AVAILABLE COP;

(No Model.)

A. L. BIKER. ELECTRIC MOTOR OR DYNAMO.

3 Sheets-Sheet 1.

Patented May 31,1898.

BEST AVAlLABL COP;

( ModL) 3 Sheets-Sheet 2.

A. L. BIKER. ELECTRIC MOTOR 0R DYNAMO.

No. 604,842. Patented Ma 31,188.

BEST AVAKLABLE C 3 SheetsSheet 3.

(No Model.)

A. L. BIKER. ELECTRIC MOTOR OR DYNAMO.

No. 604,842. Patented May 31, 1898.

mi wesses,

BEST AVAlLABLE COP- UNITED I STATES PATENT OFFICE.

ANDREW L. 'RIKER, on NEW roan, Y.

ELECTRIC MOTOR OR DYNAM SPECIFICATION forming part of Letters Patent No, 604,842, dated May 31, 1898.

Application filed ber 24, 1897. Serial NO- 659,709. (No model.)

which are entirely inclosed in a casing, which I also forms the, frame of the machine.

. I The objects of the, invention are to secure compactness of structure and facility in obtaining access to the brushes of the machine,

is while providing a weatherprooficasing, facility in assembling the armature, and strength and efliciency in the armature construction. ,The improvements whereby these objects are attained are illustrated in the accompanying 2o drawings, in which-"- .Figure 1 isa section of the motor and casing lengthwise of the armature-shaft. Fig. 2 is an elevation of'one end of the machine. Fig. '3 is an end vicwot the armature-spider,

showing also one of the soft-iron rings; and Fig. 4 is an end view of the armature-flange.

The casing or inclosing frame comprises a body A, in the form of ahollow casting of ap proxnnately rectangular cross-section, and

' end pieces or extensions A A secured to the body A by screws a, the whole forming a casing completely closed cxceptfodthe shaftopenings.

The shaft ll is journaled in bearings 13 in the extensions A A and is providedwith oilingdevices and means for preventing escape of-oil, which, as they form no part of the invention, do notrequire particular description.

The extension A incloses the brushes 0 and .40 commutator-1). The brushes are supported upon studs 0, set in holes in the casing and secured by nuts c. 'lhesebrushcs are arranged, as shown, one above the other near one side of the extension, which is of less width than the body A. Atthis side of the extension is I a door A", hinged at a and arranged to open downwardly, and thus expose and give access to the brushes 0. This arrangement greatly eonduces to convenience in use of the motor '50 for propulsion of vehicles and at the same time does not sacrifice compactness, which is of much importance in motors used for propulsion. It is desirable to place the motor as close as possible to the body of the vehicle, making it very inconvenient to get access to the brushes at the top of the casing. By arranging the brushes one above the other in an extension ,of the casing and in close proximity to a door opening downwardly or up wardly ready access can be had to the brushes without disturbing the motor .or any permanent part otthe vehicle.

The door A is fastenedsbya boltd, pivoted to an ear d on the extension and adapted to drop between project-ions (Z on the door, the end of the bolt being threaded and provided with a wing-nut (Z for tightening. Any other suitable fastening device could be used.

The armature-frame is composed of a series of soft-iron rings E, surrounding and supported by a cast-iron spider l lleretofore in armatures of this type ithas been customary generally to fasten them together by means of bolts passing through the rings, since the bolt-holes were entirely in the metal of the rings the bolts had to be insulated from the rings to avoid losses. Dillerent means were employed to key the ringsto the spider. By the present invention I avoid the nccessity of insulating the bolts and utilize the latter both to fasten the different parts of the armature-frame solidly together and to key the rings to the spider. The latter is provided with four radial arms f, though the number may be greater or less. The outer surfaces are rounded by turning in a lathe, so that they fit snugly inside the rings E, as shown in Fig. I}. In the outer surface of each arm is milled ahalt-round groove f, and opposite in the inner edge of each ring is stamped a corresponding haltround hole. The bolts 9 thus engage both the spider and the rings, securely fastening the twp together. It is found that when the bolts lie at the inner edge of the rings and not completely surrounded by the metal of the rings the losses through the bolts are ina-ppreciable and no insulation is required. At each end of the set of rings is a holding plate or flange G, suitably perforated for the passage of the bolts, the perforationsin one of the plates being threaded to engage the threaded ends BEST AVAlLABLE ooPt of the bolts. 'This constitutes a solid structure of comparatively few parts, easily as- ;sembled and dismembered.

Having now particularly described my invention, what I claim as new, and desire to I secure by Letters Patent, is-

1. The combination with the motorhaving its brushes arranged one above the other, of an inclosing casing having at one end an extension of less width than the body of the casing, said extension inelosing and supportmg the brushes, and having a door in one side thereof to give access to the brushes,

- substantially as described.

1 5 2. 'In an armature, the combination with a spider having radial arms grooved longitudi dually in their outer surfaces, rings surrounding and supported by said spider and pro "tide in their inner edges with cuts correspouding to said grooves, and fastcningbolts and provided in their inner edges with cuts 7 corresponding to said grooves, end plates or flanges provided with bolt-holes, and fastening-bolts engaging the arms and rings, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ANDREW L. BIKER. W itnesscs:

SAML. RIKER, J12, JNO. M. RICHARDS. 

